Quick Guide to PDF generation in Ruby

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A user guide (not coincidentally, a PDF file) is also available for download. Here's where the PDF generation happens. the option to save the file. buffer.seek(0) return FileResponse(buffer, as_attachment=True, filename='www.cronistalascolonias.com.ar'). Hello Gen Z: Engaging the Generation of Post-Millennials - Kindle edition by Madden, Claire. Download it once and read it on your Kindle device, PC, phones or. Go from idea generation to launching your web The complete Hello Web App package: Videos + Screencasts + eBooks (PDF,.ePub Free Civil IES Master GATE Materials PDF Book Download Link from www.cronistalascolonias.com.ar, in Engineering.

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Read and generate pdf in Java- iText Tutorial

In this iText tutorial, I am writing various code examples read a pdf file and generate PDF file. iText library helps to generate pdf files from java applications dynamically.

These code examples are categorized into multiple sections based on the work they do OR functionality they achieve. With each java pdf example, I have attached a snapshot of PDF file so that you can visualize what exactly code is writing in PDF file. You may extend these examples to get text from database or some API response in json and write to pdf.

I have tried to put as many examples as I found useful to put here to help you all while you work on pdf files in Java. Through given examples use simple java programs, you can reuse this code in web applications.

Table of Contents 1. Overview of iText library2. Commonly used iText classes3. iText hello world example4. Setting file attributes to PDF5. Adding images to PDF6. Creating tables in PDF7. Creating lists in PDFs8. Styling and formatting PDF output9. Create password protected PDF files Create PDF with limited permissions Read and modify an existing PDF Write PDF as Output Stream in HTTP response

Let&#;s start the tutorial with an introduction to iText library.

1. Overview of iText library

On brighter side, iText is an open source API. Note that though iText is open source, you still need to purchase a commercial license if you want to use it for commercial purposes. iText is a freely available Java library from www.cronistalascolonias.com.ar The iText library is powerful and supports the generation of HTML, RTF, and XML documents, in addition to generating PDFs. You can choose from a variety of fonts to be used in the document. Also, the structure of iText allows you to generate any of the above-mentioned types of documents with the same code. Isn&#;t it great feature, right?

The iText library contains classes to generate PDF text in various fonts, generate tables in PDF document, add watermarks to pages, and so on. There are many more features available with iText which I will leave on you to explore.

To add iText into your application, include following maven repository into your www.cronistalascolonias.com.ar file.

<dependency> <groupId>www.cronistalascolonias.com.ardf</groupId> <artifactId>itextpdf</artifactId> <version></version> </dependency>

Or you can download the latest jar files from maven repository.

2. Commonly used iText classes

Let&#;s list down and get familiar with important classes which we are going to use in this application.

www.cronistalascolonias.com.arnt : This is the most important class in iText library and represent PDF document instance. If you need to generate a PDF document from scratch, you will use the Document class. First you must create a Document instance. Then you must open it. After that you add content to the document. Finally you close the Document instance.
www.cronistalascolonias.com.araph : This class represents a indented &#;paragraph&#; of text. In a paragraph you can set the paragraph alignment, indentation and spacing before and after the paragraph.
www.cronistalascolonias.com.arr : This class represents a chapter in the PDF document. It is created using a Paragraph as title and an int as chapter number.
www.cronistalascolonias.com.ar : This class contains all specifications of a font, such as family of font, size, style, and color. Various fonts are declared as static constants in this class.
www.cronistalascolonias.com.ar : This class represents a list, which, in turn, contains a number of ListItems.
www.cronistalascolonias.com.arble : This is a table that can be put at an absolute position but can also be added to the document as the class Table.
www.cronistalascolonias.com.ar : An Anchor can be a reference or a destination of a reference. A link like we have in HTML pages.
www.cronistalascolonias.com.arter : When this PdfWriter is added to a certain PdfDocument, the PDF representation of every Element added to this Document will be written to the outputstream attached to writer (file or network).
www.cronistalascolonias.com.arder : Used to read a PDF document. Simple and clear.

2. iText hello world example

Let&#;s start writing our example codes with customary Hello World application. In this application, I will create a PDF file with a single statement in content.

import www.cronistalascolonias.com.artFoundException; import www.cronistalascolonias.com.artputStream; import www.cronistalascolonias.com.arnt; import www.cronistalascolonias.com.arntException; import www.cronistalascolonias.com.araph; import www.cronistalascolonias.com.arter; public class JavaPdfHelloWorld { public static void main(String[] args) { Document document = new Document(); try { PdfWriter writer = www.cronistalascolonias.com.artance(document, new FileOutputStream("www.cronistalascolonias.com.ar")); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(new Paragraph("A Hello World PDF document.")); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (DocumentException e) { www.cronistalascolonias.com.artackTrace(); } catch (FileNotFoundException e) { www.cronistalascolonias.com.artackTrace(); } } }

4. Set file attributes to PDF file

This example shows how to set various attributes like author name, created date, creator name or simply title of the pdf file.

5. Add images to PDF file

An example to show how images can be added to PDF files. Example contain adding images from file system as well as URLs. Also, I have added code to position the images within document.

6. Generate tables in PDFs

Below example shows how to add tables in a pdf document.

public static void main(String[] args) { Document document = new Document(); try { PdfWriter writer = www.cronistalascolonias.com.artance(document, new FileOutputStream("www.cronistalascolonias.com.ar")); www.cronistalascolonias.com.ar(); PdfPTable table = new PdfPTable(3); // 3 columns. www.cronistalascolonias.com.arthPercentage(); //Width % www.cronistalascolonias.com.arcingBefore(10f); //Space before table www.cronistalascolonias.com.arcingAfter(10f); //Space after table //Set Column widths float[] columnWidths = {1f, 1f, 1f}; www.cronistalascolonias.com.arths(columnWidths); PdfPCell cell1 = new PdfPCell(new Paragraph("Cell 1")); www.cronistalascolonias.com.arderColor(www.cronistalascolonias.com.ar); www.cronistalascolonias.com.ardingLeft(10); www.cronistalascolonias.com.arizontalAlignment(www.cronistalascolonias.com.ar_CENTER); www.cronistalascolonias.com.articalAlignment(www.cronistalascolonias.com.ar_MIDDLE); PdfPCell cell2 = new PdfPCell(new Paragraph("Cell 2")); www.cronistalascolonias.com.arderColor(www.cronistalascolonias.com.ar); www.cronistalascolonias.com.ardingLeft(10); www.cronistalascolonias.com.arizontalAlignment(www.cronistalascolonias.com.ar_CENTER); www.cronistalascolonias.com.articalAlignment(www.cronistalascolonias.com.ar_MIDDLE); PdfPCell cell3 = new PdfPCell(new Paragraph("Cell 3")); www.cronistalascolonias.com.arderColor(www.cronistalascolonias.com.ar); www.cronistalascolonias.com.ardingLeft(10); www.cronistalascolonias.com.arizontalAlignment(www.cronistalascolonias.com.ar_CENTER); www.cronistalascolonias.com.articalAlignment(www.cronistalascolonias.com.ar_MIDDLE); //To avoid having the cell border and the content overlap, if you are having thick cell borders //www.cronistalascolonias.com.arrBorderPadding(true); //www.cronistalascolonias.com.arrBorderPadding(true); //www.cronistalascolonias.com.arrBorderPadding(true); www.cronistalascolonias.com.arl(cell1); www.cronistalascolonias.com.arl(cell2); www.cronistalascolonias.com.arl(cell3); www.cronistalascolonias.com.ar(table); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (Exception e) { www.cronistalascolonias.com.artackTrace(); } }

7. Create list items in PDF file

Below example will help you in understanding that how to write lists in pdf files using iText library.

Document document = new Document(); try { PdfWriter writer = www.cronistalascolonias.com.artance(document, new FileOutputStream("www.cronistalascolonias.com.ar")); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(new Paragraph("List Example")); //Add ordered list List orderedList = new List(www.cronistalascolonias.com.arD); www.cronistalascolonias.com.ar(new ListItem("Item 1")); www.cronistalascolonias.com.ar(new ListItem("Item 2")); www.cronistalascolonias.com.ar(new ListItem("Item 3")); www.cronistalascolonias.com.ar(orderedList); //Add un-ordered list List unorderedList = new List(www.cronistalascolonias.com.arRED); www.cronistalascolonias.com.ar(new ListItem("Item 1")); www.cronistalascolonias.com.ar(new ListItem("Item 2")); www.cronistalascolonias.com.ar(new ListItem("Item 3")); www.cronistalascolonias.com.ar(unorderedList); //Add roman list RomanList romanList = new RomanList(); www.cronistalascolonias.com.ar(new ListItem("Item 1")); www.cronistalascolonias.com.ar(new ListItem("Item 2")); www.cronistalascolonias.com.ar(new ListItem("Item 3")); www.cronistalascolonias.com.ar(romanList); //Add Greek list GreekList greekList = new GreekList(); www.cronistalascolonias.com.ar(new ListItem("Item 1")); www.cronistalascolonias.com.ar(new ListItem("Item 2")); www.cronistalascolonias.com.ar(new ListItem("Item 3")); www.cronistalascolonias.com.ar(greekList); //ZapfDingbatsList List Example ZapfDingbatsList zapfDingbatsList = new ZapfDingbatsList(43, 30); www.cronistalascolonias.com.ar(new ListItem("Item 1")); www.cronistalascolonias.com.ar(new ListItem("Item 2")); www.cronistalascolonias.com.ar(new ListItem("Item 3")); www.cronistalascolonias.com.ar(zapfDingbatsList); //List and Sublist Examples List nestedList = new List(www.cronistalascolonias.com.arRED); www.cronistalascolonias.com.ar(new ListItem("Item 1")); List sublist = new List(true, false, 30); www.cronistalascolonias.com.artSymbol(new Chunk("", www.cronistalascolonias.com.art(www.cronistalascolonias.com.arICA, 6))); www.cronistalascolonias.com.ar("A"); www.cronistalascolonias.com.ar("B"); www.cronistalascolonias.com.ar(sublist); www.cronistalascolonias.com.ar(new ListItem("Item 2")); sublist = new List(true, false, 30); www.cronistalascolonias.com.artSymbol(new Chunk("", www.cronistalascolonias.com.art(www.cronistalascolonias.com.arICA, 6))); www.cronistalascolonias.com.ar("C"); www.cronistalascolonias.com.ar("D"); www.cronistalascolonias.com.ar(sublist); www.cronistalascolonias.com.ar(nestedList); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (Exception e) { www.cronistalascolonias.com.artackTrace(); }

8. Generate PDF and style / format PDF file content

Let&#;s see some examples of styling the content of PDF file. Example contains the usage of Fonts as well as chapter and sections as well.

Font blueFont = www.cronistalascolonias.com.art(www.cronistalascolonias.com.arICA, 8, www.cronistalascolonias.com.ar, new CMYKColor(, 0, 0, 0)); Font redFont = www.cronistalascolonias.com.art(www.cronistalascolonias.com.arR, 12, www.cronistalascolonias.com.ar, new CMYKColor(0, , 0, 0)); Font yellowFont = www.cronistalascolonias.com.art(www.cronistalascolonias.com.arR, 14, www.cronistalascolonias.com.ar, new CMYKColor(0, 0, , 0)); Document document = new Document(); try { PdfWriter writer = www.cronistalascolonias.com.artance(document, new FileOutputStream("www.cronistalascolonias.com.ar")); www.cronistalascolonias.com.ar(); //www.cronistalascolonias.com.ar(new Paragraph("Styling Example")); //Paragraph with color and font styles Paragraph paragraphOne = new Paragraph("Some colored paragraph text", redFont); www.cronistalascolonias.com.ar(paragraphOne); //Create chapter and sections Paragraph chapterTitle = new Paragraph("Chapter Title", yellowFont); Chapter chapter1 = new Chapter(chapterTitle, 1); www.cronistalascolonias.com.arberDepth(0); Paragraph sectionTitle = new Paragraph("Section Title", redFont); Section section1 = www.cronistalascolonias.com.artion(sectionTitle); Paragraph sectionContent = new Paragraph("Section Text content", blueFont); www.cronistalascolonias.com.ar(sectionContent); www.cronistalascolonias.com.ar(chapter1); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (Exception e) { www.cronistalascolonias.com.artackTrace(); }

9. Generate password protected PDF file

Let&#;s see an example of creating password protected pdf file. Here is used to set password to generated PDF.

We need to add bouncy castle jars generating for password protected PDFs. I have added these jars in sourcecode of examples for this post.

private static String USER_PASSWORD = "password"; private static String OWNER_PASSWORD = "lokesh"; public static void main(String[] args) { try { OutputStream file = new FileOutputStream(new File("www.cronistalascolonias.com.ar")); Document document = new Document(); PdfWriter writer = www.cronistalascolonias.com.artance(document, file); www.cronistalascolonias.com.arryption(USER_www.cronistalascolonias.com.ares(), OWNER_www.cronistalascolonias.com.ares(), www.cronistalascolonias.com.ar_PRINTING, www.cronistalascolonias.com.arTION_AES_); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(new Paragraph("Password Protected pdf example !!")); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (Exception e) { www.cronistalascolonias.com.artackTrace(); } }

Create PDF with limited permissions

In this example, I am setting few file permissions for a pdf file to limit access for other users. Following are several permission values:

www.cronistalascolonias.com.ar_PRINTING www.cronistalascolonias.com.ar_ASSEMBLY www.cronistalascolonias.com.ar_COPY www.cronistalascolonias.com.ar_DEGRADED_PRINTING www.cronistalascolonias.com.ar_FILL_IN www.cronistalascolonias.com.ar_MODIFY_ANNOTATIONS www.cronistalascolonias.com.ar_MODIFY_CONTENTS www.cronistalascolonias.com.ar_SCREENREADERS

You can provide multiple permissions by ORing different values. For example www.cronistalascolonias.com.ar_PRINTING | www.cronistalascolonias.com.ar_COPY.

public static void main(String[] args) { try { OutputStream file = new FileOutputStream(new File( "www.cronistalascolonias.com.ar")); Document document = new Document(); PdfWriter writer = www.cronistalascolonias.com.artance(document, file); www.cronistalascolonias.com.arryption("".getBytes(), "".getBytes(), www.cronistalascolonias.com.ar_PRINTING , //Only printing allowed; Try to copy text !! www.cronistalascolonias.com.arTION_AES_); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(new Paragraph("Limited Access File !!")); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(); } catch (Exception e) { www.cronistalascolonias.com.artackTrace(); } }

Read and modify an existing PDF file

To complete this tutorial, let&#;s see an example of reading and modifying a PDF file using PDFReader class provided by iText library itself. In this example, I will read content from PDF file and add some random content to it&#;s all pages.

public static void main(String[] args) { try { //Read file using PdfReader PdfReader pdfReader = new PdfReader("www.cronistalascolonias.com.ar"); //Modify file using PdfReader PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileOutputStream("www.cronistalascolonias.com.ar")); Image image = www.cronistalascolonias.com.artance("www.cronistalascolonias.com.ar"); www.cronistalascolonias.com.arbsolute(, 50); www.cronistalascolonias.com.arolutePosition(f, f); for(int i=1; i<= www.cronistalascolonias.com.arberOfPages(); i++) { PdfContentByte content = www.cronistalascolonias.com.arerContent(i); www.cronistalascolonias.com.arge(image); } www.cronistalascolonias.com.ar(); } catch (IOException e) { www.cronistalascolonias.com.artackTrace(); } catch (DocumentException e) { www.cronistalascolonias.com.artackTrace(); } }

Write PDF as Output Stream in HTTP response

This is the last example in list and in this example, I am writing the content of created PDF file into output stream attached to HttpServletResponse object. This will be needed when you want to stream the PDF file in a client-server environment.

Document document = new Document(); try{ www.cronistalascolonias.com.artentType("application/pdf"); www.cronistalascolonias.com.artance(document, www.cronistalascolonias.com.arputStream()); www.cronistalascolonias.com.ar(); www.cronistalascolonias.com.ar(new Paragraph("www.cronistalascolonias.com.ar")); www.cronistalascolonias.com.ar(new Paragraph(new Date().toString())); //Add more content here }catch(Exception e){ www.cronistalascolonias.com.artackTrace(); } www.cronistalascolonias.com.ar(); }

That&#;s all for this big list of iText example codes. Leave a comment if something is not clear to you OR you would like to add any other example into this list.

Happy Learning !!

Let us know if you liked the post. That’s the only way we can improve.

Источник: www.cronistalascolonias.com.ar

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